Yes!

What John Lennon saw when he climbed up a ladder and looked through a telescope mounted at its top, pointed to the ceiling. This was an installation at a gallery for a showing of works by Yoko Ono. He said that if it had said "No" that he would have left the gallery right then. Not to be nasty, but I suppose it is safe to say that many people would much have rather it had said "No." Or "NO!" or "NO! NO! NO! Go away! Nonononononono...!""